Dawn McMillan 
Night Skies [PDF ebook] 

Learn how to create equations while traveling through our solar system! You will also learn how variables and expressions are used to form mathematical equations, and you’ll get an opportunity to create your own equations while on your journey through space! With vibrant photos, math charts and diagrams, grade-appropriate text, and informational text features to help navigate the text, students will learn practical, real-world applications of math skills as they are introduced to variables, expressions, and equations, and build their STEM skills.